.bash_profile/.bashrc snippet that will show git information (branch, commits ahead and behind) in your prompt

git_prompt.sh

# Add the following code to ~/.bash_profile or ~/.bashrc
function git_branch() {
    git rev-parse --abbrev-ref HEAD 2> /dev/null
}

function git_prompt() {
    local branch=$(git_branch)
    local deltas=$(git rev-list --left-right --count $branch...origin/$branch 2> /dev/null)
    local stats=$(git diff --stat 2> /dev/null | tail -n 1)

    if ! [ -z "$branch" ]; then
        echo -n "[\[\033[0;36m\]$branch\[\033[0m\]"

        if ! [ -z "$deltas" ]; then
            local ahead=$(echo $deltas | awk '{ print $1 }')
            local behind=$(echo $deltas | awk '{ print $2 }')

            echo -n " | "
            echo -n "↓\[\033[0;31m\]$behind\[\033[0m\] "
            echo -n "↑\[\033[0;32m\]$ahead\[\033[0m\]"
        fi

        if ! [ -z "$stats" ]; then
            local files=$(echo $stats | rg -oP '\d+ files? changed' | awk '{ print $1 }')
            local insertions=$(echo $stats | rg -oP '\d+ insertions?' | awk '{ print $1 }')
            local deletions=$(echo $stats | rg -oP '\d+ deletions?' | awk '{ print $1 }')

            echo -n " | "
            echo -n "\e[33m~${files:-0}\e[39m,"
            echo -n "\e[32m+${insertions:-0}\[\033[0m\],"
            echo -n "\[\033[0;31m\]-${deletions:-0}\[\033[0m\]"
        fi

        echo "] "
    fi
}

function prompt() {
    PS1="\u@\h:\w\\$\[$(tput sgr0)\] $(git_prompt)"
}

PROMPT_COMMAND=prompt